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The gram molecular mass of P2O5 is 141.94, and each molecule contains 7 atoms, as shown by adding the subscripts in the formula. 0.400 grams constitutes 0.400/141.94 or about 2.812 X 10-3 mole, and the number of atoms is therefore the product of this number of moles, 7, and Avogadro's Number, or about 1.19 X 1022 atoms, to the justified number of significant digits.

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Q: How many atoms in 0.400 g of Phosphorous 2 Oxygen 5?
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